It is also why TAI's rate was adjusted in the 1990's to compensate for
the red-shifted data that had been collected at NIST in Boulder, since
it sits at about 5400' (1700m) above sea level (as well as other
facilities not at sea level).
Warner
Are you sure you aren't confusing red shift (which has been
a known factor since the 60's) with blackbody shift (which
only arose in the 90's as clocks hit the 1e-15 level)?
/tvb
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